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Riba South  Sustainability Through Envelope Efficiency
 

Riba South Sustainability Through Envelope Efficiency

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    Riba South  Sustainability Through Envelope Efficiency Riba South Sustainability Through Envelope Efficiency Presentation Transcript

    • Matt Robinson Natural Building Technologies
    • Natural Building Technologies
      • Environmental building systems.
      • Full technical support in sales, design, specification and on-site
      • Our systems are proven on the continent over many years and tens of thousands of buildings on the continent and now UK.
      • Cost effective when compared to ‘traditional’ UK systems.
    • The Issue: Buildings
      • Use too much:
        • Energy
        • Resources
      • Generate too much:
        • Waste
        • C0 2
      • Are Unhealthy
    • The Issue – UK energy use
    • The Agenda: Energy in Buildings
    • The route: Policy
      • 2006, 2010, 2016 building regs – Part L
      • Code for Sustainable Homes
      • Low Carbon Building Programme
      • Green Taxes?
    • Issues: Is Zero truly 0 ?
      • What if we use a lot of energy and resources, and create a lot of pollution to do ‘Zero’?
      • What if ‘Zero’ doesn’t exist?
      • Is there a ‘sweet spot’ just below ‘Zero’?
    • Issues: Inertia and Resistance
        • Lack of Knowledge and mis-information
        • Very poor standards of construction
        • Centered around multiple trades, not buildings
        • Liability contracts vs responsibility contracts
        • Capital cost reduction
    • Issues: Inertia and Resistance
      • Really Sustainable?
        • Greenwash
        • Theory vs Reality
        • Offsetting is wrong
      • Who checks the claims?
    • Issues: A tale of two halls Sheffield Town Hall - 1897 ‘ D’ Rating, 218kwh/m2/yr London City Hall - 2003 ‘ E’ Rating, 267kwh/m2/yr +30% CO 2/ kwh/m2/yr
    • Current Situation
      • Stamford Brook:
      • 710no, cavity wall masonry dwellings
      • Monitoring of design and construction issues by Leeds Met. University.
      • CO 2 Was 10%ish better than 2006 standards
      • Many other sustainable features (recycling, wildlife, transport etc)
      • http://www.leedsmet.ac.uk/as/cebe/projects/stamford/
    • Current Situation
      • Stamford Brook:
      • 710 cavity wall masonry dwellings
      • Monitoring of design and construction issues by Leeds Met. University.
      • CO 2 Was 10%ish better than 2006 standards
      • Many other sustainable features (recycling, wildlife, transport etc)
      • http://www.leedsmet.ac.uk/as/cebe/projects/stamford/
      42% missed the 5ach target for infiltration Heat loss co-efficient 75-105% worse than predicted
    • Stamford Brook Findings: Infiltration Lights, loft hatches, wall/floor and wall/roof junctions, partition walls Patio door – unsealed threshold Rooflights leaked around frames, seals and trickle vents Service penetrations particular problem
    • Stamford Brook Findings: Heat loss
        • Y-values
          • Poor design AND
          • Not built ‘as designed’
        • Party wall heat losses
    • Stamford Brook Findings Nominal vs. Realised Heating System Efficiencies Nominal vs. Realised Thermal Bridging Y-values Nominal vs. Realised Fabric U-values ‘ Build-ability’ problems and lack of knowledge Occupant effects – e.g. Removing CFL’s
    • UK Construction Standards: Some Shocking Facts
        • 50% of new builds miss ‘as designed’ energy use by up-to 50%.
        • 30% of new builds fail infiltration standard of 10ach@5pa
      • Energy Saving Trust (2004)
      • Room in roof U-values on average 104% worse than ‘as calculated’
        • Average full-fill cavity wall was 20% worse than ‘as calculated’
      • Dept. Environment Travel Regions (DETR) (2001 report)
      • Energy use in residential buildings has increased by 20% since 1970
      • Building Research Establishment (BRE 2003+2007)
    • If I was to go there, would I start here? UK Construction industry 2008 UK Construction industry 2016
    • Solutions?
      • Eco-clichés get in the way of good, efficient and truly environmental solutions.
      • Howard Liddell
    • Solutions ?
    • Solutions: Technology Problems
      • Overstatement of performance
      • Inappropriate site’s
      • Maintenance costs
      • Embodied energy
      • ROI, Payback
      • Disposal / recycling
      • Capital expenditure choices
      • UK cost
      • Excuse for envelope
    • Solutions
    • There is Another Way! We have the solutions We have the knowledge We have the research We have the built case-studies Its been done before (Look over the North Sea and oop North at our neighbours...)
    • The Solution
      • “ Construction is about creating thermal efficiency, not mini power stations.”
      Imtiaz Farookhi Chief Executive NHBC
    • Eco or Sustainable or....
      • Passive Haus
        • ‘ Ultra low energy building standard.’
      • R2000
        • ‘ ...based on an energy consumption target.’
      • Minergie
        • ‘ ...quality label for new and refurbished low-energy-consumption buildings.’
      • UK 2006 L2
        • ‘ Conservation of fuel and power...’
    • Solutions!
    • Where are the savings?
      • Clear that space heating and DHW are the key areas
      • Lights, appliances and cooking are 'simple'
    • We have the solution no.1
      • Thermal coherence of the building shell
        • Good (low) U Values
        • Good (low) Y Values
        • Low Infiltration rates
        • Thermal response
        • Decrement Delay
    • We have the solution no.2
      • Passive features
        • Building form
        • Orientation
          • Passive solar (heat) gain
          • Passive solar (light) gain
          • Manage glazing heat loss
        • Shading (planting or built
        • Shelter belts
      Images: Greenspec
    • We have the solution no.3
      • Increase in air-tightness means:
      • Air Quality
        • Avoid toxic or off-gassing materials
      • Ventilation
        • 10-3ach = Passive ventilation?
        • 3ach or better = MVHR?
    • We have the solution no.4
      • Moisture management
      • Active
        • effective ventilation (MVHR or passive)
      • Passive
        • True ‘Breathing wall’ systems
    • We have the solution no.5
      • Appliances
        • A-rated
        • Low energy lights
      • Hot water
        • Reduce demand
        • Reduce dead legs and pipe runs
        • Heat efficiently
    • We have the solution no.6
      • Lower heating and cooling loads and peak demands
      • =
      • use renewables effectively
    • Summary of ‘The Solution’
      • Efficiency / passive is 80% of the battle
      • Renewables / active /technology are last 20%
      • Think about managing moisture & removing toxins
    • If you could focus on one thing....
      • “ Thermal bridging was shown as the worst area of non-compliance. Other significant non-compliance areas included conservatories, u-values , areas of windows , doors and rooflights , internal lighting , commissioning certificates , O&M manuals and air-leakage”
      • The Energy Efficiency Partnership for Homes (Future Energy Solutions)
      • Building Regulations Compliance (BRE )
    • The Effect of y-values
    • The importance of detailing: ThermoPlan
      • Window on ‘outside’ = psi of 0.159w/m2/k
      • Window ‘setback’ = psi of 0.099w/m2/k
    • Low Ψ values
      • Un-accredited + 0.15w/m 2 /k
      • Accredited + 0.08w/m 2 /k
      • ThermoPlan +0.04w/m 2 /k
      • Pavaclad +0.04w/m 2 /k
      • Diffutherm + 0.02w/m 2 /k
    • UK Construction: The Solution
        • Use systems that have proven track record in low energy buildings.
        • Use systems that with low Ψ / Y values and low U-values.
        • Ensure that U, Ψ and Y values are built ‘as designed’
        • Use construction systems that have an airtight strategy and a contractor responsible for airtightness.
    • Build it efficiently Article: Joseph Little, Deantus Projects Ltd in Construct Ireland Is this the real challenge?
    • Change:- Its not (just) Architects...
      • Supply chain delivery
      • Certification processes
      • Training in ALL parts of the industry
      • New design and aesthetics (*waves bye to bricks*)
      • Site organisation – shell building
      • From liability to responsibility
      • Financial and insurance drivers
      • Home owner education
    • Holistic Solutions
      • Energy
      • Carbon
      • Resources
      • Building Fabric
      • Human Health
      • Deliverability
      • Durability
    • Its a Team Effort
      • Client
      • Architects
      • Planners
      • M&E
      • Structural
      • Building Control
      • Contractor
      • Subbie
      They need to understand all this (and more)
    • Summary
      • Set clear targets
      • Efficiency, Efficiency, Efficiency
      • Good passive design and detailing
      • The building envelope comes first
      • Airtightness and Insulation
      • Ventilation
      • Simple vs Technology
      • Get a good team
      • Its not easy
    • Matt Robinson Natural Building Technologies